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When you and your partner get into a 69 postion, but you pull your head over each others private areas and place your lips to each others ass and either partner can then burb and or fart back and forth into each other ass and mouth. hince the filthy'9er
Ron: "Why does your breath smell like ass?"
Greg: "Probably because I did the filthy'9er all night."
by miner 69er July 30, 2015
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